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#!/bin/sh
# SPDX-FileCopyrightText: 2023-2025 The Remph <lhr@disroot.org>
# SPDX-License-Identifier: GPL-3.0-or-later
set ${BASH_VERSION:+-o pipefail} -efu
# $wobdir is a `wrapper' directory that prevents a race between `test -p
# $wobfifo` and `>$wobfifo', during which $wobfifo can be removed, causing
# it to be created again as a regular file. If the removal also removes the
# parent directory $wobdir, then sh's > operator can't creat(2). Of course,
# the race could still happen between removing $wobfifo and $wobdir, but
# this is less likely.
wobdir=$XDG_RUNTIME_DIR/swob.$WAYLAND_DISPLAY
wobfifo=$wobdir/pipe wobini= SWOB_AUDIO=
scan_confdirs() {
for dir in ${XDG_CONFIG_HOME:+"$XDG_CONFIG_HOME"} ~/.config /etc "${0%/*}"/../etc; do
test -d "$dir"/swob || continue
if test -z "$wobini" -a -r "$dir"/swob/wob.ini; then
wobini=$dir/swob/wob.ini
fi
if test -z "$SWOB_AUDIO" -a -r "$dir"/swob/audio; then
SWOB_AUDIO=`cat "$dir"/swob/audio`
fi
if test -n "$wobini" -a -n "$SWOB_AUDIO"; then
return
fi
done
}
new_wobini() {
# fine, I will make my own wob.ini(5)
wobini=${XDG_CONFIG_HOME:-~/.config}/swob/wob.ini
echo >&2 "$0: no swob/wob.ini found; writing default to $wobini"
mkdir -p "${wobini%/*}"
cat >$wobini <<EOF
[style.volume]
background_color = 000000
[style.mute]
background_color = af0000
[style.brightness]
background_color = a89800
EOF
}
start_wob() {
if test -p "$wobfifo"; then
return # Already started
fi
rm -rf "$wobdir" # clear the decks
# temporary fifo (call mkfifo(1) asap to minimise possibility of races)
mkdir "$wobdir"
mkfifo -m600 "$wobfifo"
test -n "$wobini" || new_wobini
# spawn wob process with temporary file(s)
{
trap 'rm -r "$wobdir"' 0
# Don't `exec' wob here, else the trap won't work
wob -c "$wobini" <$wobfifo
} &
}
glob_match() {
# MUST be called with set +f
test $# -gt 1 -o -e "$1"
}
select_audio() {
# could guess at /run/user/`id -u`, but let's not jump the gun here
sound_sys=$1 rundir=${2:-$XDG_RUNTIME_DIR} tool=$3
test -n "$rundir" &&
glob_match "$rundir/$sound_sys"* &&
command -v "$tool" >/dev/null 2>&1 &&
SWOB_AUDIO=$sound_sys
}
get_audio_type() {
# MUST be called with set +fu
case $SWOB_AUDIO in
pipewire|pulse|alsa) return ;;
'') ;;
*) echo >&2 "$0: warning: unrecognised SWOB_AUDIO: $SWOB_AUDIO" ;;
esac
select_audio pipewire "$PIPEWIRE_RUNTIME_DIR" wpctl && return
select_audio pulse "$PULSE_RUNTIME_PATH" pactl && return
SWOB_AUDIO=alsa # default to ALSA
}
set_vol() {
set +fu
get_audio_type
set -fu
case $SWOB_AUDIO in
pipewire)
case $1 in
toggle) to_set=mute ;;
*) to_set='volume -l 1.0' ;;
esac
wpctl set-$to_set @DEFAULT_AUDIO_SINK@ "$1"
wpctl get-volume @DEFAULT_AUDIO_SINK@ | sed -E \
-e 's/^Volume: ([0-9]+)\.([0-9][0-9])/\1\2/' \
-e 's/\[MUTED\]/mute/'
;;
pulse)
case $1 in
toggle) to_set=mute ;;
*) to_set=volume ;;
esac
pactl set-sink-$to_set @DEFAULT_SINK@ "$(echo "$1" | sed -E 's/(.*)([+-])$/\2\1/')"
percent=`pactl get-sink-volume @DEFAULT_SINK@ | sed -En 's/.* ([0-9]+)%.*/\1/p'`
mute_cmd='pactl get-sink-mute @DEFAULT_SINK@'
mute_out=`$mute_cmd`
case $mute_out in
'Mute: yes') muted=1 ;;
'Mute: no') muted= ;;
*) echo >&2 "$0: warning: bad output from $mute_cmd: $mute_out" ;;
esac
echo "$percent ${muted:+mute}"
;;
*)
if test "$SWOB_AUDIO" != alsa; then
echo >&2 "$0: WARNING: internal inconsistency! SWOB_AUDIO: \`$SWOB_AUDIO'"
fi
amixer sset Master "$1" | sed -E '
# Extract percentage, keep original line for later
h
s/.*\[([0-9]+)%\].*/\1/
t match
d
: match
# Get original line back
x
# Test if audio is muted
/\[off\]/ {
x
s/$/ mute/
b
}
# else
x
s/$/ volume/'
;;
esac
}
do_cmd_get_percent() {
case $1 in
volume|vol)
set_vol "$2"
;;
brightness|brt)
brightnessctl -m set "$2" | sed -En 's/(.*[^0-9])?([0-9]+)%.*/\2 brightness/p'
;;
*)
echo >&2 "$0: error: unrecognised argument: $target"
exit -1
;;
esac
}
## MAIN ##
scan_confdirs
start_wob
{
do_cmd_get_percent "$@"
sleep 3 # Needs to be long enough that there aren't too many wob(1)
# processes spawned and respawned consecutively on repeated
# taps, but short enough that there aren't too many /bin/sh
# processes hanging around simultaneously running sleep(1)
# from this script! 3 seconds is an uneducated guess.
} >$wobfifo
# Don't let wob die if it's still receiving input from another process; wait
# until it says it's finished
# To solve the above mentioned problem of too many /bin/sh processes hanging
# around, we could setsid(1) wob so the script can exit without waiting as
# soon as it's done sleeping (the existing situation is that as long as one
# script sleeps, the shell that spawned the wob process will wait until that
# sleep is done)
test -z ${!-} || wait $! # surprisingly, $! could be unset (not just zero-length)
|
